Guard for grinding-wheels and similar rotating bodies



K. DELLGREN.

GUARD FOR GRINDING WHEELS AND SIMILAR ROTATING BO DIE S.

APPLICATION FILED DEC.26, 1918- I I 1,335,223. Pdtentd Mar. 30,1920,

'KARL DELLGREN, OF VASTERVIK, SWEDEN.

GUARDFOR GRINDING-WHEELS AND'SIMILAR ROTATING BODIES.

Specification of Letters Patent. Patented M31330, 1920.

Application fiIe'd'D ecember 26, 1918. Serial No. 268,368.

To all whom it mayconoem:

Be it known that I, KARL DELLGREN, a citizen of the Kingdom of Sweden,residing at Vastervik, Sweden, have invented new and useful Improvementsin Guards for Grinding-VVheelS and Similar Rotating Bodies, of which thefollowing is a specification.

This invention relates to guards for grinding wheels and similarrotating bodies.

The principal object of the invention is to provide a guard of this kindadapted to prevent damages caused by the flying off of the rotatingbody.

Another object is guard possessing a certain degree of elasticity andadapted to be adjusted in conformity with the diameter of the. rotatingbody according as its diameter decreases, owing to the wear of the body.

The invention consists, chiefly, in the combination of an adjustableframe, transverse bolts in said frame, two adjustable arcuate platesoverlapping each other and bearing against said bolts, and one or moreelastic members, as for instance wires, attached to said frame andsurrounding said plates, so as to press them against the transversebolts of the frame.

A preferred embodiment of the invention is illustrated in theaccompanying drawing in which- Figure 1 is a sideview of a guardconstructed in conformity with the invention. Fig. 2 shows a front viewof the same guard.

Referring to the drawing, the dotted line 1 denotes a rotating body forinstance a grinding wheel. Placed at a distance apart from said body andextending along its periphery is a strap made for instance of sheet ironor the like. In the embodiment shown in the drawing the strap consistsof two parts 2 and 3 overlapping each other at the ends 4. Bearingagainst the outer side of the strap 2, 3 are one or more elasticmembers, as for instance wires, spiral springs or the like, extending inperipheral direction. In the embodiment shown said elastic membersconsist of two wires'5 and 6 placed side by side. The guard constructedin the manner described is supported by a frame arranged. as follows:

Disposed at each side of the rotating body 1 and at the center thereofis a plate 7 and 8 respectively, each of said plates being protheprovision of such a vided with an aperture 9 enabling the frame to beslid onto the shaft of the rotating body. Secured to each plate 7 and 8are a 7 number of arms, two of which 10 and 11 at each plate areconnected with the corresponding plate, the other ends of said arms 10and 11 being spaced apart so as to render the periphery of the grindingwheel accessible through the interspace between the arms 10 and 11.Passed through the lastnamed ends of the arms 10 and 11 are bolts 1.2and 13, to which, on the one hand, the wires 5 and 6 and, on the otherhand, the free ends of the strap 2, 3 are secured. Thus the bolts 12 and13 together with the arms 10 and 11 support the ends of the wires 5 and6 and the free ends of the strap 2, 3. Extending from each plate 7, 8are two arms 14 and 15 secured to the corresponding plate and throughthe outer ends of which are passed bolts 16 and 17 respectivelysupporting other points of the strap 2, 3. Furthermore, the ends of astirrup 18 placed outside the strap 2, 3 are attached to the plates 7and 8. As will appear from the drawing, the wires 5 and '6 are wrappedabout the portion 19 of the stirrup situated outside the strap, thewires being prevented from sliding on the strap 2, 3 by means of a plate20 bearing against the wires and retained against the same by screw 21screwed into the portion 19.

To the plate 7 or to both plates 7 and 8 a rod or arm 22 may be fixed bymeans of which the guard may be attached to the frame supporting therotating body.

In all the arms 10, 11, 14 and 15 and in the stirrup 18 apertures 23 areprovided. By placing the screws 24: connecting the arms and the stirrupwith the plates 7 and 8 in different apertures 23, the guard may beadjusted, as desired, to the decrease of the diameter of the rotatingbody owing to the use of the same.

The principal advantage attained by a guard constructed as describedabove consists in this that the guard, on account of the elasticity ofthe members 5 and 6, is capable of catching the fragments in case of therotating body flying off, without necessitating the strap 2, 3 to bemade of a material. possessing a particularly high degree ofresistibility.

Having now particularly described and ascertained the nature of my saidinvention and in What manner'the same is to be performed, I declare thatWhat I claim is 1. A guard for grinding disks and the like, comprising aframe, arcuate adjustable plates mounted on the frame concentric to thedisk, and reinforcing Wires extending around the plates and connected attheir ends to the frame thereby binding the plates onto the frame. 32.In a guard for grinding disks and the like, a frame consisting of sideplates havingapertures to receive the shaft of the disk,

a stirrup connecting the plates on opposite posite sides of the disk,arcuate plates passing between the disk andstirrup, and Wires connectedto the stirrup extending over the arcuate plates for binding the latteronto the connecting bolts.

name.

In testimony whereof I have signed my KARL 'DELLGREN. i

